body {
    margin: 0;
    background: black;
}


.bottle {
    width: 80px;
    height: 200px;
    background: linear-gradient(to bottom, #f9f9f9 5%, #d1d1d1 100%);
    border: 2px solid #FFF;
    border-radius: 35px 35px 25px 25px;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 2px 2px rgba(0, 0, 0, 0.1);
    clip-path: polygon(15% 0, 85% 0, 100% 100%, 0 100%);
}

.liquid {
    width: 100%;
    height: 0;
    background: #4db8ff;
    position: absolute;
    bottom: 0;
    transition: height 0.4s ease-out;
    border-radius: 0 0 25px 25px;
    background-image: linear-gradient(to top, rgba(77, 184, 255, 0.6), rgba(77, 184, 255, 1));
}

.bottle .logo {
    height: 35px;
    width: auto;
    margin-top: 100%;
    margin-left: 9%;
    position: absolute;
    z-index: 1000;
}
/* 按钮基本样式 */
#startGameBtn {
    transition: all 0.3s ease;
    cursor: pointer;
}

/* 鼠标悬停样式 */
#startGameBtn:hover {
    background-color: #4183d7;
    /* 深一点的蓝色 */
    transform: scale(1.05);
    /* 轻微放大 */
}

/* 鼠标点击样式 */
#startGameBtn:active {
    background-color: #3b76c9;
    /* 更深的蓝色 */
    transform: scale(0.95);
    /* 轻微缩小 */
}